4 a) Find the measures of all the unknown angles, x, y and z, in the given figare : 1100 yo 20
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2x + 110 = 180 ( angle opposite to equal sides are equal)
- x = 35°
2z + y = 180
y + x = 180 ( linear pair)
- y = 145°
=> 2z + 145° = 180
- z = 17.5°
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