Answer:
Step-by-step explanation:
Using Pythagoras Theorem
opp² + adj² = hyp²
1. 10² + 7² = 100 + 49 = 149 = hyp²
hyp = √149 = 12.2065556157 ≅ 12.21
2. 21² = 19² + x²
441 = 361 + x²
441 - 361 = x² = 80
x = √80 = 8.94427191 ≅ 8.944
c. let a represent the diagonal line dotted
22² = 16² + a²
484 = 256 + a²
484 - 256 = a²
228 = a²
a = √228 = 15.0996688705
x² = a² + (44-16)²
x² = (15.0996688705)² + 28²
x² = 228 + 784 = 1012
x = √1012 = 31.8119474412 ≅ 31.81
