3.2. Perpendicular Lines http://www.ck12.org
Guided Practice
- Isl⊥m? Explain why or why not.
- Find the value ofx.
- Find the value ofx.
Answers:
- If the two adjacent angles add up to 90◦, thenlandmare perpendicular.
23 ◦+ 67 ◦= 90 ◦. Therefore,l⊥m.
- The two angles together make a right angle. Set up an equation and solve forx.
( 12 x− 1 )◦+( 10 x+ 3 )◦= 90 ◦sox= 4 ◦.
- The two angles together make a right angle. Set up an equation and solve forx.
( 2 x)◦+x◦= 90 ◦sox= 30 ◦.
Practice
Find the measure of^6 1 for each problem below.
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In questions 10-13, determine ifl⊥m.
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Find the value ofx.
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