已知三角形的三边a、b、c的长分别为45cm、80cm、125cm,求这个三角形的周长和面积.
已知三角形的三边a、b、c的长分别为
cm、
cm、
cm,求这个三角形的周长和面积.
数学人气:643 ℃时间:2019-11-21 00:03:24
优质解答
已知三边为a、b、c,
则周长为a+b+c=
+
+
=12
cm,
∵a
2+b
2=c
2,
∴本三角形为直角三角形,
故面积S=
×
×
=30cm
2.
答:这个三角形周长为12
cm,面积为30cm
2.
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