f3 math
2012-10-21 11:37 pm
If the lengths of two sides of an isosceles triangle are 5 cm and 10 cm, what is the perimeter of the triangle?
回答 (2)
2012-10-22 12:14 am
✔ 最佳答案
two sides of an isosceles triangle are equal , there are two choices 1) 5, 5, 10
2) 5, 10, 10
for 1) , it is impossible
Let a be the equal sides, and b be the remaining side
a +a > b
2a> b
the answer is 5, 10, 10, since 20 > 5
the perimeter of the triangle is 25 //
2012-10-22 12:05 am
∵ Since it’s a isos.Δ∴ The side lengths must be 5, 10, 10 or 5, 5, 10∵ 5 + 5 = 10; 10 + 10 > 5∴ The side lengths are 5cm, 10cm, 10cm (Δ inequality) I HOPE THIS CAN HELPYOU! ~ ^_^
2012-10-22 16:04:41 補充：
So, perimeter = 5 + 10 + 10 = 20cm.
2012-10-22 16:04:41 補充：
So, perimeter = 5 + 10 + 10 = 20cm.
參考: My Maths World
收錄日期: 2021-04-13 19:04:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121021000051KK00298