Question

Find ∠BCD A)60 B)20 C)80 D)120

Answer 1

Answer:

• We know : The exterior angle is equal to the sum of two non-adjacent interior amhles. Set up an equation and solve for x :

$\longrightarrow \tt5x + 10 = 3x + 3x$

$\longrightarrow \tt \: 5x + 10= 6x$

$\longrightarrow \tt10 = 6x - 5x$

$\longrightarrow \tt \: 10 = x$

Replacing value :

✯$\tt m \: \angle \: \: BCD = 5 \times 10 + 10 = \boxed{ \tt{60}}$

• Our Final answer is 60 .

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