In fig. l∥m . The value of (9x+10)o is

A
$10 °$
B
$100 °$
C
$120 °$
D
$110 °$

Solution:

Alternate exterior angles are equal.

$\begin{matrix} 9 x + 10 = 11 x - 10 \\ 10 + 10 = 11 x - 9 x \\ 2 x = 20 \\ x = 10 \\ ∴ value of 9 x + 10 = 9 (10) + 10 \\ = 90 + 10 = 100 ° \end{matrix}$

In fig. $l ∥ m$ . The value of ${(9 x + 10)}^{o}$ is

Solution:

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