Which equation could be used to find the perimeter of an isosceles triangle, with two sides 13 cm long, a base 10 cm long and a height of 12 cm?
A.
P = (10 × 12) ÷ 2
B.
P = 2 × 13 + 10
C.
P = 13 + 10 + 12
D.
P = 2 × 10 + 13
The perimeter is the sum of the three sides.
P = 2 × 13 + 10
What value of f makes the equation true?
f – 18.4 = 11.8
6.6 because you have no number for F so you are supposed to do 11.8-18.4 and that equals 6.6 and 18.4-6.6=11.8
To find the perimeter of an isosceles triangle, we need to add up the lengths of all three sides. In this case, we have two sides that are 13 cm long and a base that is 10 cm long.
Option A: P = (10 × 12) ÷ 2
This equation calculates the perimeter of a triangle with the base and height, rather than the sides. Therefore, it is not the correct equation to find the perimeter in this case.
Option B: P = 2 × 13 + 10
This equation correctly adds up the two sides (13 cm × 2) and the base (10 cm), which gives the correct perimeter. Therefore, this is a possible equation to find the perimeter.
Option C: P = 13 + 10 + 12
This equation simply adds up the lengths of all three sides, including the two sides that are 13 cm. Therefore, this is a possible equation to find the perimeter.
Option D: P = 2 × 10 + 13
This equation adds up the base (10 cm) and doubles it, then adds the length of one side (13 cm). This does not account for the second side that is also 13 cm long, so it is not the correct equation to find the perimeter.
Based on the explanations above, options B and C could be correct equations to find the perimeter of the given isosceles triangle.