BECE Mathematics 2020 Paper

Concept:Use Pythagoras' theorem for a right-angled triangle.Solution:The side opposite the right angle is the hypotenuse, which is $13$.So, $5^2 + t^2 = 13^2$.This gives $25 + t^2 = 169$.Subtract $25$ from both sides: $t^2 = 144$.Take the square root: $t = \sqrt{144}$.Since $12 \times 12 = 144$, we get $t = 12$.Answer:Option A ($12$)