Circle theorems

[small grail]

What am I missing?

original image without the drawing

<@&791435371564892232>

[dire sierra]

Answer : BAD= 25 degrees.

Using the circle theorem we know angle subtended by diameter at the circumference is always 90 degrees, hence ∠BAD = 90 degrees. However, from point B we have another line, DB making an ∠OBD of 65 degrees with OD. Hence, with respect to AD, ∠BAD will be 90 - 65 = 25 degrees.

Let me know if it does not make sense

[unique urchin]

BAD = 65?

[dire sierra]

do the questin again now tht yk how the steps r carried out

[dire sierra]

No..

[unique urchin]

Yes

BAD = BOD / 2 = (180-25-25) / 2 = 130/2 = 65

[unique urchin]

This is all correct

[dire sierra]

Sorry

@unique urchin

[small grail]

it is literally not giving me any marks for some reason

Might just be mathswatch being mathswatch

[unique urchin]

Yep just mathswatch being mathswatch

[grim grail]

Blud did not cook

[small grail]

also I think here you mean to use the theorem that states the angle subtended by the radius and a tangent is 90 degrees

which doesn't apply to BAD = 90

[pallid monolith]

No he means Thales’s theorem

But it’s just BD is not the diameter

[grim grail]

why is blud changing names

[small grail]

idk what that theorem is

not taught in GCSE

[grim grail]

it is

you just dont know its name

its just hte one about a triangle which has all three points touching the circumference with one side as the diameter