look at this triangle, work out length of BC

Answer:
√105
Step-by-step explanation:
The square value of hypotenuse is equal to sum of base and side length (sum their square)
13^2 = 8^2 + BC^2
169 = 64 + BC^2
105 = BC^2
BC = √105
Answer:
≈ 10.25 cm
Step-by-step explanation:
Pythagora
BC² = AB² - AC²
BC = √(13² - 8²)
= √(169 - 64)
= √105
≈ 10.25 cm