25. AB, CD
and EF are three lines intersecting at the same point
(i) Find x, if y = 45° and z = 90°.
(ii) Find a, if x = 3a, y = 5x and z = 6x.
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Step-by-step explanation:
(i) sum of angles of three lines = 360°
2x + 2y + 2z = 360°
2 (x + 45° + 90°) = 360°
2x = 360° - 270°
2x = 90°
x = 45°
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