Question

please help, super easy 7th grade math! worth a lot of points

Answer 1

Answer:

57mm

Step-by-step explanation:

Length of missing side= perimeter- known lengths

= 152mm- (30+20+45)mm

= (152 - 95)mm

= 57mm

Answer 2

You must take the total perimeter and subtract what you know to find the missing side. So 152-30-20-35= 57