Question

what is formula for area of right angled triangle
solve it using side as 10 km

Answer 1

the formula for area of right angle triangle is 1/2×base×height

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Answer 2

the formula for right angled triangle is
1/2*base*height
you have only given one side of a triangle, but we need to know other side too
this is what I can answer your question
I hope it will help you