
problems 50..59
problems 70..79
60.
Calculate edges AB and AC.
61.
Given is square ABCD.
DF=a; BE=b;AF=x;
LBAE=LEAF.
Prove that x=a+b;
62.
Calculate radius r of the smallest circle.
63.
Given is square ABCD.
AB=a; FC=FE=b;
Prove that x^{2}=2ab;
64.
Given is right angled triangle ABC with two contacting inscribed circles.
AB=5; BC=4; AC=3;
Calculate radius r of the circles.
65.
Calculate the area of the colored triangle.
66.
Prove the formula for the truncated cone.
67.
68.
69.

