Hình thang có một đáy lớn 2.8dm, đáy bé: 1.6dm, chiều cao 0.8dm. a) Tính diện tích bìa cứng? b) Cắt một phần tư diện tích. Tính diện tích của bìa cứng còn lại?
a) diện tích hình thang là :\(\left(2,8+1,6\right)\times0,8:2=1,76dm^2\)
b) 1/4 diện tích miếng bìa là: \(1,76:4=0,44dm^2 \)
diện tích miếng bìa còn lại là: \(1,76-0,44=1,32dm^2\)
Lesson 1: Trapezoid sheet has a large bottom 2.8dm, baby bottom 1.6dm, height 0.8dm.
a) Calculate the area of the cardboard?
b) Cut a quarter of the area. Calculate the area of the cardboard remaining?
Lesson 2: ABCD rectangle with DC length = 27cm, AD = 20.4cm. E is a point on AB. Calculate the area of the triangle ECD?
Lesson 3: (HSKG): A trapezoidal field with a baby bottom 26m, the bottom is 8m lower than baby, the bottom is 6m lower. Average 100m2 harvested 70.5 kg paddy. How much is the field harvested?
A rectangular board has a circumference eight times the width of the card. Calculate the area of the cardboard, knowing the length of the cardboard is 99 cm
a. The area of a trapezoid is 20m the larger base is 55dm and the smaller base is 45dm. Find the height of trapezoid.
b. Find the average of two bases of the trapezoid, known that: the area of trapezoid is 7 m2 and its height is 2m.
A rectangle with a length and a half in width. If each dimension is added 2m new rectangle with additional 64m2 area. Calculate the area of the original rectangle?
A rectangle with a length and a half in width. If each dimension is added 2m new rectangle with additional 64m2 area. Calculate the area of the original rectangle?
A rectangle with a length and a half in width. If each dimension is added 2m new rectangle with additional 64m2 area. Calculate the area of the original rectangle?
A rectangle with a length and a half in width. If each dimension is added 2m new rectangle with additional 64m2 area. Calculate the area of the original rectangle?
A rectangle with a length and a half in width. If each dimension is added 2m new rectangle with additional 64m2 area. Calculate the area of the original rectangle?
Water well head is a circle with a radius of 0.7m. It is built into wells surrounding the well head 0.3m wide. Calculate the area of the wells.
