His isosceles triangle has two sides of equal length, a, that are longer than the length of the base, b. the perimeter of the triangle is 15.7 centimeters. the equation 2a + b = 15.7 models this information. if one of the longer sides is 6.3 centimeters, which equation can be used to find the length of the base?

12.6 + b = 15.7

Step-by-step explanation:

Here a be the length of equal sides of the isosceles triangle and b be the length of the base of the triangle,

And, the given equation that model the given situation is,

2 a + b = 15.7

Since, a = 6.3,

By putting this value in the above equation,

We get,

2 × 6.3 + b = 15.7

⇒ 12.6 + b = 15.7

Which is the required equation that will use to find the base of the triangle.