A man at ground level measures the angle of elevation to the top of the building to be 87°. If at this point, he is 20 meters away from the building, what is the height of
the building?​

Will give are given that xy is parallel to zw. if xz is a transversal that intercepts xy and zw, angle angle alternate interior angles. since xy is parallel to zw, we know that these angles are we also know that angle xvy and angle zvw are , and thus congruent. we can conclude that △xyv ~ △zwv using the similarity theorem.

Nine more than four times a number is the same as one less than twice the number. find the number?

List the sides of δrst in in ascending order (shortest to longest) if: a ∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12°