In triangle ABC, if the angles are in the ratio 2:3:4, what is the measure of the largest angle?
Correct Answer: 80 degrees
- Step 1: Understand that the angles of triangle ABC are in the ratio 2:3:4.
- Step 2: Assign a variable 'x' to represent a common multiplier for the angles. So, the angles can be expressed as 2x, 3x, and 4x.
- Step 3: Write an equation for the sum of the angles in a triangle. The sum of the angles is 180 degrees, so we have: 2x + 3x + 4x = 180.
- Step 4: Combine the terms on the left side of the equation. This gives us: 9x = 180.
- Step 5: Solve for 'x' by dividing both sides of the equation by 9. This gives us: x = 20.
- Step 6: Now, find the largest angle, which is represented by 4x. Substitute x into this expression: 4x = 4 * 20.
- Step 7: Calculate 4 * 20 to find the largest angle: 4 * 20 = 80 degrees.
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