灵鹊做题网英文数学题 求答案及过程 急! 谢谢
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英文数学题 求答案及过程 急! 谢谢
A semicircle with centre O （the origin) and radius 5 units, meets Ox at A and B and the positive y-axirs at C.
1. State the coordinates of A,B and C.
2. If a point （x,y) lies one the sencircle, show that x的平方+y的平方=25.
3. Verify that the point p(-3,4) lies on the semicircle and show by using gradients that 角APB=90度.
A semicircle with centre O （the origin) and radius 5 units, meets Ox at A and B and the positive y-axirs at C.
1. State the coordinates of A,B and C.
2. If a point （x,y) lies one the sencircle, show that x的平方+y的平方=25.
3. Verify that the point p(-3,4) lies on the semicircle and show by using gradients that 角APB=90度.
以O为圆心,5为半径的半圆,与x轴相交于A、B两点,与y轴的正半轴相交于C点.1.标出A、B、C的坐标.2.如果有一个点（x,y）位于半圆上,证明x的平方+y的平方=25.3、用∠APB=90度,验证p(-3,4)位于半圆上.答案：1.如图2.略3.由∠APB=90度,-3的平方+4的平方=25.所以p(-3,4)位于半圆上.