Question

the diagram shows a triangle.
what is the value of a?
a = \square^\circ
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Explanation:

Step1: Sum triangle angles to 180°

$(a-41^\circ) + 58^\circ + 73^\circ = 180^\circ$

Step2: Simplify left-hand side

$a - 41^\circ + 131^\circ = 180^\circ$
$a + 90^\circ = 180^\circ$

Step3: Solve for $a$

$a = 180^\circ - 90^\circ$

Answer:

$90$