Q7 : Given that AOB, COD and EOF are straight lines. Find the value
of the unknown in the following figure
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Answer:
EOD = COF (V.O.A)
COF = 4a-5
4a + 4a - 5 + 2a - 15 = 180⁰ (linear pair)
10a - 20 = 180⁰
10a = 180⁰+20⁰
10a = 200⁰
a = 20⁰
AOC = 4×20 = 80⁰
EOD = 4×20 - 5 = 75⁰
FOB = 2×20 - 15 = 25⁰
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