Question

Work out the size of angle a.

angle a =
°

Give a reason why.

Work out the size of angle b.

angle b =

°

Answer 1

Step-by-step explanation:

$\angle{a} = 56°$ using the definition of vertical angles

The sum of the interior angles of a triangle is 180 so

$\angle{a} + \angle{b} + 90 = 180$

$\Rightarrow 56° + \angle{b} + 90° = 180°$

or

$\angle{b} = 34°$