Right angle FCD intersects and at point C. FCE is congruent to ECD. ECD is complementary to DCB.

Angle B measures 60°. What is the measure of the angle that is complementary to angle B?
Rectangle QRST is shown. Angle QRT is congruent to angle STR, and angle STR is complementary to angle QTR.

Given:1 is complementary to 2. 2 is complementary to 3.Prove:m1 = m3





Two lines are intersected by a third line.





Which statements are true about the angles in the diagram? Select three options.
Triangle ABC is a right triangle.

Lines DE and AB intersect at point C.

The figure shows three lines that intersect at point N.

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