Question

2

D
3
In the diagram above, Z1 = 2x+20 and
Z2 = 3x+10. Find the measure of 21.
Z1 = [ ? 10

Answer 1

9514 1404 393

Answer:

∠1 = 40°

Explanation:

Angles 1 and 2 are "alternate interior" angles, so are congruent.

∠1 = ∠2

2x +20 = 3x +10

10 = x . . . . . . . . . . . subtract 2x+10 from both sides

The measure of ∠1 is ...

∠1 = 2x +10 = 2(10) +20 . . . . . degrees

∠1 = 40°