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Xelga [282]
3 years ago
7

What is the measure of def 78° PLEASE HELP

Mathematics
1 answer:
Scorpion4ik [409]3 years ago
7 0

Answer:

The measure of arc DEF is 204°

B is correct

Step-by-step explanation:

In a circle center at O.

∠DOF and ∠DEF are lie on same base but ∠DOF at center and ∠DEF on circle.

Thus, ∠DOF = 2 ∠DEF

minor ∠DOF = 2 x 78 = 156°

We need to find arc DEF.

DEF is central angle of major∠DOF

major∠DOF + minor ∠DOF = 360°     (Complete angle at center)

            major∠DOF  +  156° = 360°

                         major∠DOF = 204°

major∠DOF is arc DEF.

Hence, The measure of arc DEF is 204°

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