直角三角形,求边之间的关系,就是利用勾股定理:a^2+b^2=c^2.
(1)c^2=a^2+b^2=15^2+20^2=625,故c=25;
(2) b^2=c^2-a^2=41^2-9^2=1600,故b=40;
(3) a^2=c^2-b^2=61^2-60^2=121,故a=11.
直角三角形,求边之间的关系,就是利用勾股定理:a^2+b^2=c^2.
(1)c^2=a^2+b^2=15^2+20^2=625,故c=25;
(2) b^2=c^2-a^2=41^2-9^2=1600,故b=40;
(3) a^2=c^2-b^2=61^2-60^2=121,故a=11.