The length of the curved surface is the circumfrence of a circle with radius r = 10/2 = 5 decimeters.
Length of curved surface = 2π x 5 = 10π ≈ 31.4 decimeters.
Answer:
80
Step-by-step explanation:
110-180=70
30+70=100
100-180=80
Angle 1 and 3 will be the same 101 and angle 2 and 4 will be the same 79