Need help with my exam questions

[round storm]

I didn't come on the day my teacher discussed the exam questions, and i wanna know how to do the ones i got wrong 😔 this is one of them

[sharp token]

first of all you must know the property of iscoscles triangles

like in that triangle ABC, angle cab is equal to angle cba

and as ac is parallel to bd, we can apply the property of alternate interior angles here

now you can retry and report if you undertoos, and if not, then probe further thoughts

[round storm]

Its confusing🥲 so now i know angle CAB = CBA but how do i use that to find a?

[round storm]

I understand this one

[sharp token]

use the property that sum of all the three angles inside a triangle of 180 degrees, and assume angle cab=angle cba=x

[round storm]

OK i think i get it now, x = 140 so i divided it by 2, so a° should be 70

Thank you🙏

[sharp token]

wait wait

[sharp token]

yea correct

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