Question

what is the value of s?
$s-43\degree$
$s-40\degree$
$s = \square\degree$
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Explanation:

Step1: Sum triangle angles to 180°

$$s + (s-40^\circ) + (s-43^\circ) = 180^\circ$$

Step2: Simplify left side

$$3s - 83^\circ = 180^\circ$$

Step3: Isolate the term with s

$$3s = 180^\circ + 83^\circ$$
$$3s = 263^\circ$$

Step4: Solve for s

$$s = \frac{263^\circ}{3} \approx 87.67^\circ$$

Answer:

$\frac{263}{3}$ or approximately $87.67^\circ$