A. 200 m
Feedback Let the triangle and parallelogram have common base b,let the Altitude of triangle is h1 and of parallelogram is h2(which is equal to 100 m), then
Area of triangle =1/2∗b∗h1
Area of rectangle =b∗h2
1/2∗b∗h1=b∗h2
1/2∗b∗h1=b∗100
h1=100∗2=200m