This requires a diagram.
Assuming that < 3, <4, and <5 are adjacent and together form a straight angle along EF,
<3 + <4 + <5 = 180
But, <3 = 90
=> 90 + <4 + <5 = 180
=> <4 + <5 = 180 - 90 = 90
All straight lines measure 180 degrees. In the diagram below, the straight line EF contains three angles, < 3, <4, and <5. If <3 is 90 degrees. What is the measurement of <4 + <5 = _________?
A. 180 degrees
B. 90 degrees
C. 45 degrees
1 answer