Question

Look at the figure shown below.

Jeff determines that triangle CGD is an isosceles triangle.

Which statement best describes Jeff’s conclusion?

It is correct because angle GCD = 54°, angle GDC = 63°, and angle CGD = 63°.
It is incorrect because angle GCD = 36°, angle GDC = 81°, and angle CGD = 63°.
It is incorrect because angle GCD = 54°, angle GDC = 36°, and angle CGD = 90°.
It is correct because angle GCD = 36°, angle GDC = 72°, and angle CGD = 72°.