alleryStart learning →Two complementary angles measure (2x+10)° and (x+20)°. Find x.
A50
B20
C10
D30
Answer & Solution
Correct answer: B. 20
Complementary angles sum to 90°, so 2x+10+x+20=90. Thus 3x=60 and x=20; the angles are 50° and 40°.
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