Question

If DB is drawn, what is the measure of angle TDB?


30

45

60

90

Answer 1

You need a bit of visualization to do this; In the shape, imagine the triangle was actually drawn. Now in your head, take that triangle out of the volume and lay it down on a plane (flat surface). What is the angle?

Answer 2

90?

Answer 3

yes :)

Answer 4

are you sure for some reason I cant picture it

Answer 5

I'm absolutely sure... let me see if I can find a way to help you visualize it... Okay imagine the triangle is drawn. Now imagine you rotate it around TD until it "fuses" with on the faces. If you imagine this, you'll see that their angles match. And at the base of the face is quite obviously 90°

Answer 6

oh ok thankyou!