Question

finding missing angles in quadrilateral from parallelogram​

Answer 1

Answer:

From here we can see that 4(90°) = 360°. In other words, a quadrilateral has a total of 360°.

We can use this fact to determine the missing angle in any quadrilateral or four sided shape. Here are some examples.

We have been given three angles and need to determine the measure of the fourth.

Step 1: Add together the measures of the known angles.

98° + 44° + 73° = 215°

Step 2: Subtract the sum from 360° to determine what remains for the fourth angle.

360° - 215° = 145°

The measure of the unknown angle is 145°.