Q31:
A small, rectangular park has a perimeter of 560 feet and a diagonal measurement of 200 feet. What is its area, in square feet?
A. 19,200
B. 19,600
C. 20,000
D. 20,400
E. 20,800
Ans=A
請問是解聯力嗎?
x^2+y^2=200^2
x+y=560/2
請問咬如何解這聯立