Question

the diagram shows a triangle.
triangle image with angles 90°, 15s, and 20s + 20°
what is the value of s?
s = \square°
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Explanation:

Step1: Sum angles to 180°

$$90 + (20s + 20) + 15s = 180$$

Step2: Simplify left side

$$110 + 35s = 180$$

Step3: Isolate term with s

$$35s = 180 - 110$$
$$35s = 70$$

Step4: Solve for s

$$s = \frac{70}{35}$$

Answer:

$s = 2$