9. What are two straight lines that cross each other at a right angle? A. Curved B. Parallel C. Perpendicular D. Broken 10. In which one of the following pairs of angles are the angles always equal to each other? A. Vertical B. Complementary C. Supplementary D. Adjacent

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yarafigue26

High School

9. What are two straight lines that cross each other at a right angle?

A. Curved
B. Parallel
C. Perpendicular
D. Broken
10. In which one of the following pairs of angles are the angles always equal to each other?

A. Vertical
B. Complementary
C. Supplementary
D. Adjacent

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kudzordzifrancis

Verified answer

The Answer to 9 is
C perpendicular

EXPLANATION
Whenever two straight lines cross each other at right angles
$(90\degree)$ , we say they are perpendicular

The answer to question 10 is
A. vertical

EXPLANATION

Two angles that are vertically opposite to each other are equal.
They also called X-angles

So from the diagram
$a=b$

and

$c=d$

Vertical angles are always equal
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