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Sagot :
Answer:
z = 106°
As a straight line has total 180°
Find the top inside angle:
t + 142° = 180°
t = 180° - 142°
t = 38°
Two opposite angles sum up to exterior angle.
Now find z:
68° + 38°
106°
Solution:
It should be noted:
- The interior angles of a triangle sum up to 180°.
This means that:
- (180 - 142) + 68 + (180 - z) = 180
Simplify the LHS.
- 38 + 68 + (180 - z) = 180
- 106 + (180 - z) = 180
Subtract 106 both sides.
- -106 + 106 + (180 - z) = 180 - 106
- => 180 - z = 74
Subtract 180 both sides.
- => 180 - z = 74
- => 180 - 180 - z = 74 - 180
- => -z = -106
Divide both sides by -1.
- -z/-1 = -106/-1
- => z = 106
The measure of ∠z is 106°.
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