Please help!! Geometry!!

Question

What is the measure of angle B if it is contained in triangle DAB?

180

90

55

45

None of these.

Answer 1

Hi,

First, make triangle ABD

Second, you see the <B is inscribed angle that it is half of opposite arc. what is opposite arc? half a circle

Third, < B = 1/2 ( half a circle) = 1/2 * 180 = 90

I hope it is useful,

Minoo