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Use an 84 cm long wire to form a triangle. The ratio of the length of the three sides of the triangle is 3:4:5. How many centimeters are the lengths of the three sides?
84 × 33 + 4 + 5 = 21 (CM) 84 × 43 + 4 + 5 = 28 (CM) 84 × 53 + 4 + 5 = 35 (CM) a: the lengths of the three sides are 21 cm, 28 cm and 35 cm respectively
Use an 84 cm long wire to form a triangle. The ratio of the length of the three sides of the triangle is 3:4:5. How many centimeters are the lengths of the three sides?
84 × 33 + 4 + 5 = 21 (CM) 84 × 43 + 4 + 5 = 28 (CM) 84 × 53 + 4 + 5 = 35 (CM) a: the lengths of the three sides are 21 cm, 28 cm and 35 cm respectively
Use 84cm long wire to form a triangle. The length ratio of the three sides of the triangle is 3:4:5. How many square centimeters is the area of the triangle?
It is necessary to calculate the process, result and solution,
Let the short side 3x, then the other sides 4x, 5x
3x+4x+5x=84
x=7
The three sides are 21cm, 28cm and 35cm respectively
3²+4²=5²
So the triangle is a right triangle
Area s = 21 * 28 / 2 = 294 square centimeter
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