Question

D, h, and p are coplanar ?

Answer 1

Yes

Explanation:

Co-planer means they exist on the same plane.

HDP is co-planer.

GDP is co-planer.

HPG is co-planer.

HDG is collinear. This is because they exist on the same line.

Answer 2

Yes

Explanation:

But if you stuck a pencil through the center of the picture the line that it makes would not be coplanar.