① The part of any two points on a straight line is called (). ② an isosceles triangle has two sides, 3cm and 7cm long respectively, and its circumference is () cm ① The part of any two points on a straight line is called () ② An isosceles triangle has two sides, 3cm and 7cm in length, and its circumference is () cm If you don't understand the problem, find the formula

① The part of any two points on a straight line is called (). ② an isosceles triangle has two sides, 3cm and 7cm long respectively, and its circumference is () cm ① The part of any two points on a straight line is called () ② An isosceles triangle has two sides, 3cm and 7cm in length, and its circumference is () cm If you don't understand the problem, find the formula

① Line segment
② Because it is an isosceles triangle, the bottom is 3cm, and the two waists are 7cm (the triangle of the bottom 7waist 3 does not exist), so the perimeter is 3 + 7 × 2 = 17cm