Math Problem Statement

Find the area of the figure below. The figure is made up of two triangles: Triangle ABE and Triangle CDE with given bases and heights. Also, find the perimeter of a figure made up of a square, a triangle, and a rectangle with given dimensions.

Solution

Let's go through the problems in the image you've uploaded:

Question 5:

Find the area of the figure below.

The figure appears to be made up of two triangles:

  1. Triangle ABE with base AB=7cmAB = 7 \, \text{cm} and height AE=6cmAE = 6 \, \text{cm}.
  2. Triangle CDE with base CD=4cmCD = 4 \, \text{cm} and height DE=6cmDE = 6 \, \text{cm}.

The area of a triangle is calculated by the formula: Area of a triangle=12×base×height\text{Area of a triangle} = \frac{1}{2} \times \text{base} \times \text{height}

  • Area of triangle ABE: Area of ABE=12×7×6=21cm2\text{Area of ABE} = \frac{1}{2} \times 7 \times 6 = 21 \, \text{cm}^2

  • Area of triangle CDE: Area of CDE=12×4×6=12cm2\text{Area of CDE} = \frac{1}{2} \times 4 \times 6 = 12 \, \text{cm}^2

Thus, the total area is: Total area=21+12=33cm2\text{Total area} = 21 + 12 = 33 \, \text{cm}^2

Question 6:

The figure is made up of a square, a triangle, and a rectangle. Find the perimeter of the figure.

Let's break it down:

  1. Square: One side of the square is 4cm4 \, \text{cm}.
  2. Rectangle: The rectangle has one side of 7cm7 \, \text{cm} and the other side as 2cm2 \, \text{cm}.
  3. Triangle: One side of the triangle is given as 5cm5 \, \text{cm}.

We need to sum the outer edges of the figure to find the perimeter.

  • Perimeter of the square: Since only one side of the square is part of the outer edge, we only take that side: 4cm4 \, \text{cm}.
  • Perimeter of the rectangle: The relevant sides are 7cm7 \, \text{cm} and 2cm2 \, \text{cm}.
  • Triangle side: The outer side of the triangle is 5cm5 \, \text{cm}.

Now, summing the relevant sides: Perimeter=4cm+7cm+5cm+2cm=18cm\text{Perimeter} = 4 \, \text{cm} + 7 \, \text{cm} + 5 \, \text{cm} + 2 \, \text{cm} = 18 \, \text{cm}

Summary of answers:

  • Answer to Question 5: 33cm233 \, \text{cm}^2
  • Answer to Question 6: 18cm18 \, \text{cm}

Do you need any further clarifications or details? Here are 5 related questions:

  1. How is the area of a triangle derived?
  2. Can we find the perimeter of any shape by summing all the outer sides?
  3. How would the area change if the height of both triangles were doubled?
  4. Why do we divide by 2 when calculating the area of a triangle?
  5. What is the difference between perimeter and area in geometric figures?

Tip: For composite figures, break the shape into known geometrical shapes to find the area or perimeter.

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Math Problem Analysis

Mathematical Concepts

Geometry
Area
Perimeter
Triangles
Composite Figures

Formulas

Area of a triangle = (1/2) × base × height
Perimeter of a figure = sum of the lengths of all outer sides

Theorems

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Suitable Grade Level

Grades 5-7