Math Problem Statement

Work out the area of the triangle correct to the nearest 0.1 cm².

Solution

To calculate the area of the triangle, we’ll use the formula for the area of a triangle with two sides and an included angle:

Area=12×a×b×sin(C)\text{Area} = \frac{1}{2} \times a \times b \times \sin(C)

where:

  • aa and bb are the lengths of two sides,
  • CC is the included angle between these sides.

From the image:

  • The two equal sides are each 6 cm (an isosceles triangle),
  • The included angle is 4141^\circ.

Step-by-Step Solution

  1. Identify the values: a=6 cm,b=6 cm,C=41a = 6 \text{ cm}, \quad b = 6 \text{ cm}, \quad C = 41^\circ

  2. Use the formula: Area=12×6×6×sin(41)\text{Area} = \frac{1}{2} \times 6 \times 6 \times \sin(41^\circ)

  3. Calculate sin(41)\sin(41^\circ): sin(41)0.6561\sin(41^\circ) \approx 0.6561

  4. Substitute and solve: Area=12×6×6×0.6561\text{Area} = \frac{1}{2} \times 6 \times 6 \times 0.6561 =12×36×0.6561= \frac{1}{2} \times 36 \times 0.6561 =18×0.6561= 18 \times 0.6561 11.81 cm2\approx 11.81 \text{ cm}^2

Final Answer

The area of the triangle is approximately 11.8 cm², rounded to the nearest 0.1 cm².

Would you like a further breakdown or have any questions?


Here are some related questions you might find useful:

  1. How do you find the area of a triangle using side lengths and angles?
  2. What is the significance of the sine function in trigonometry?
  3. How can you find the area of other types of triangles (e.g., right triangles)?
  4. What is the law of sines and how is it applied in triangle calculations?
  5. How would you approach this if only one side and two angles were given?

Tip: Always check if the triangle is isosceles or equilateral, as it can simplify calculations by confirming equal sides or angles.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Trigonometry
Triangle Area Calculation

Formulas

Area = 1/2 * a * b * sin(C)

Theorems

Sine Rule for Area of a Triangle

Suitable Grade Level

Grades 8-10