need help with these two questions | Revision Server | Page 1

zinc oracle Apr 2, 2023, 4:49 PM

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ornate copper Apr 2, 2023, 4:51 PM

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zinc oracle

1st question you can use trig to work out the height of slanted triangles to use 1/2bh*4 + area of square

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2nd you can work out the sf (from volumes) and h of triangle b from area and base - so scale that h to get the h of triangle a

zinc oracle Apr 2, 2023, 4:58 PM

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are you able to show the working out

ornate copper Apr 2, 2023, 5:00 PM

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zinc oracle are you able to show the working out

i can write it up now if u want

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zinc oracle Apr 2, 2023, 7:40 PM

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yes ur right about the height

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how would u get the surface area for the whole pyramid

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the answer is 1300

ornate copper Apr 2, 2023, 8:18 PM

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zinc oracle the answer is 1300

yes sorry i interpreted “angle between any sloping edge and the plane” as a sloping face, just use the same method but take 55 as the angle from a corner to the plane and you should get the answer

zinc oracle Apr 2, 2023, 8:44 PM

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so times the faces by 4?

olive bane Apr 2, 2023, 9:02 PM

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Yes and add 400

zinc oracle Apr 3, 2023, 9:21 AM

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olive bane Yes and add 400

wait what is the size of one face?

olive bane Apr 3, 2023, 9:24 AM

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Base x height /2

zinc oracle Apr 3, 2023, 9:25 AM

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so 174.3 x 4=679.2

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add 400 is 1079.2

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then what do u do

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@olive bane

olive bane Apr 3, 2023, 9:36 AM

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ornate copper

^

zinc oracle Apr 3, 2023, 9:37 AM

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yes but i’m getting 1079.2

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idk how to get 1300

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hello?

distant kelp Apr 3, 2023, 9:40 AM

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Hi

zinc oracle Apr 3, 2023, 9:55 AM

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hi

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are u able to help?

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@distant kelp

olive bane Apr 3, 2023, 10:15 AM

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Are u using the exact values or the rounded values?

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That might change it

distant kelp Apr 3, 2023, 10:19 AM

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zinc oracle are u able to help?

Sure what question ?

distant kelp Apr 3, 2023, 10:38 AM

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Discord makes the quality horrible 😭🤣

ornate copper Apr 3, 2023, 10:46 AM

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zinc oracle idk how to get 1300

i explained

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the method getting 1100 assumes angles between face and plane is 55, to get 1300 you take the angle between the corners and the plane as 55

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both same method

zinc oracle Apr 3, 2023, 12:07 PM

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distant kelp

omg tysm the diagrams really help😭

zinc oracle Apr 3, 2023, 12:08 PM

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distant kelp

also where did the 8 come from?

zinc oracle Apr 3, 2023, 12:08 PM

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distant kelp Discord makes the quality horrible 😭🤣

fr ahah but i can read it

distant kelp Apr 3, 2023, 12:09 PM

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Because

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A pyramid is made up of four triangles and a square, originally there was 4 of these:

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⠀

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But in my workings I split this triangle in half so now there would be 8 in total instead of 4 in total

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If that makes any sense lmk if it doesent

zinc oracle Apr 3, 2023, 2:10 PM

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alright thank you i understand now

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i appreciate it

#need help with these two questions