Question

How do I do this?
Please help

Answer 1

∠ ADC = 100°

Explanation:

∠ CAD = ∠ BCA = 18° ( alternate angles )

The sum of the 3 angles in a triangle = 180° , then

∠ ADC = 180° - (62 + 18)° = 180° - 80° = 100°

Answer 2

In the given quadrilateral ABCD ,

• Angle BCA = 18°
• Angle ACD = 62°

Angle BCA = Angle CAD ( alternate interior angle )

Now in triangle CAD ,

We have two angles so by using angle sum property we can find the required third one ,

• Angle CAD + Angle ACD + Angle ADC = 180°
• 18 + 62 + Angle ADC = 180
• 80 + Angle ADC = 180
• Angle ADC = 180 - 80
• Angle ADC = 100