Question

数学题<英文的>

Write the equation of the circle that contains the given point Pand has its center at the origin.

1. find x if the distance between(1,3)and (x,9)is 10.
2. find the area of the rectangle with vertices A(-3,0), B(-2,-1), C(1,2), and D(0,3).
请懂的朋友们帮我写出解答的过程~!万分感谢!~

Answer 1

1. find x if the distance between(1,3)and (x,9)is 10.

如果两个点坐标（1，3）和（x，9）的距离为10，求出x的值。

方程： (x-1)(x-1) + (9-3)(9-3)= 10*10 --------勾股定理
(x-1)的平方

2. find the area of the rectangle with vertices A(-3,0), B(-2,-1), C(1,2), and D(0,3).

求出上诉4个点所围成四边形的面积。

很简单的题目，你可以自己解一下。