Answer:
John is 19 and his sister is 23.
Step-by-step explanation:
See attached image.
It's a square. A parallelogram with four equal sides is a square.
Sides: Isosceles
Angles: Acute
speed = distance / time = 20/15 = 1 1/3 m/s
8 times 12 is 96
10 times 15 is 150 add them together and get 246
