Question

Find the values of the unknowns in each of the following rectangles.​

Answer 1

Answer:

A-36°
B-36°

C-51°

D-51°

Step-by-step explanation:

First you gotta know that a four side shape (quadrilateral) have a total angle of 360° , A triangle has a total of 180° altogether and a right angled triangle is 90°.

1. To find A:

• 90° - 54°
• this is because you can see that it is a right angle which has a total of 90° so therefore you take 90° minus the 54° to get the angle for a.

2. To find B:

• 180° - 90° - 54°
• Take a look at the triangle only to find b°. Since a triangle 180°. You have to take away the 54° and 90° to get b.

3. To find C:

• 180° - 90° - 39°
• Take a look at the triangle only to find c°. Since a triangle 180°. You have to take away the 39° and 90° to get b.

4. To find D:

• 180° - 51° - 78°
• First, Minus the 90° with a 39° to get a 51°
• Take 180° and minus it with 78° and 51° to get the angle for d°.