The area of a half-square is 1 ÷ 2 = 0.5 square meter. Area of 45 squares: 45 × 1 = 45 square meters Area of 5 half-squares: 5 × 0.5 = 2.5 square meters So, the area is 45 + 2.5 = 47.5 square meters. Find the area of the shaded ﬁ gure. Exercises 3–8 1. 2. To ﬁ nd the area of a composite ﬁ gure, split it up into ﬁ gures with areas you Height: 1/2 the height of the trapezoid (use the triangles to show this) Conclusion: The trapezoid is equivalent to a rectangle having as its base the sum of the bases of the trapezoid and having a height _ the height of the trapezoid. Activity: As in the previous exercises, the child draws the figures. Equivalence Command Card #4
Mar 21, 2019 · Area of trapezoid ~ A=a+b/2*h, so if a midline is equal in length to half the other base 24 cm and height should be 9, the half of 18 cm. 12+24/2*9=18*9=162 cm² which is 3/4 of the area of a big triangle 216 cm². I never realized that "midline" is actually half a length of the big base.
Interactive Mathematics Activities for Arithmetic, Geometry, Algebra, Probability, Logic, Mathmagic, Optical Illusions, Combinatorial games and Puzzles.