Answer:
D. none of the above.
Step-by-step explanation:
Given is triangle with base = 10 cm and perpendicular height = 3 cm.
We know the formula for area of triangle is given by :-
Area =
× (Base) × (perpendicular height)
Area =
× (10) × (3)
Area = 
Area = 15 cm²
So, final answer is 15 cm².
(x-center)^2+(y-center)^2=r^2
x^2+y^2=r^2
(7)^2+(0)^2=r^2
49+0=r^2
r^2=49, r=7
x^2+y^2=49