Answer:
11) Perimeter = 61.6inches or 61.64inches
12) Perimeter = 71.2inches or 71.24inches.
Step-by-step explanation:
Shape 11; = square 11 x 14 = 140+14 = 154 area
Perimeter square side is just three sides
= 11 x 2 + 14 = 36 inches
Shape 11 triangle = b9^2 + 14^2 = sqrt 81+ sqrt 196 = sq rt 277 = 16.643317
So we use 9+ 16.643317 =25.643317
Perimeter = 25.6 + 36 = 61.6 inches
Shape 12; =
We have 20 and 16 so we square these and take away to find a^2
20^2 - 16^2 = sq rt 144 = 12 inches vertical top line
Then repeat for missing slant edge but add instead of subtract as its a slant line we are looking for
12^2 + 10^2 = 144 +100 = 244 sq rt = 2√ 61. = 15.62 inches
Perimeter therefore is 20+20 as they both sets are congruent shapes = 40
+ 15.62+15.62 = 31.24
31.24+40= 71.24 inches
