Answer:
The measure of the missing side length = 45
Step-by-step explanation:
Pythagorean Theorem states: A² + B² = C²
28² + B² = 53²
784 + B² = 2809
B² = 2809 - 784
B² = 2025
B =
B = 45
Therefore the measure of the missing side length = 45
Hope this helps!