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This test is run by .
Note that your final mark will not be saved in the system.

Basic Geometric Facts GapFill

Target Level

1-3

Running Total

Attempt

1 of 3

You must fill all the gaps before clicking ‘Check Answers!’

With reference to the diagram above, fill in the gaps to explain why angle D is equal to the sum of angles A and B:

C + A18045D = 360100120180° (angles on a straight line)

A + B + C = 360180120540° (angles in a trapeziumquadrilateraltrianglerectangle)

So 180° = A + B + 15C4590 = AD4560 + C

Subtracting DC90180 from both sides gives A + B = D

This is your 1^st attempt! You get 3 marks for each one you get right. Good luck!

Pass Mark

72%