Area / Perimeter of Regular Shapes

Just memorize the triangle and rectangle area / perimeter formula and circle area / circumference  is more than enough for these simple problems.

1985 AJHSME Problem 12

1986 AJHSME Problem 18

1987 AJHSME Problem 5

1988 AJHSME Problem 13

1989 AJHSME Problem 24

1990 AJHSME Problem 15

1991 AJHSME Problem 10

1993 AJHSME Problem 21

1994 AJHSME Problem 19

2010 AMC 8 Problem 13

2019 AMC 8 Problem 2

2019 AMC 8 Problem 4

2024 AMC 8 Problem 11

The ratio of the areas of two similar shapes is the square of the ratio of their perimeter / side lengths

1994 AJHSME Problem 16