Question

Can some one help me. I don’t understand

Answer 1

The height is 6-1= 5 units
The length is 8-1=7 units
Apply pythagoras' theorem:
spqrt(5^2+7^2)= 8.6023
Rounded to 1 d.p. Is 8.6 units

Answer 2

BC = √[(8-1)^2 +(1-6)^2]
BC = √(49+25
BC = √74
BC = 8.6

answer
8.6 units