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An auditorium is 15 meters long, 9 meters wide and 2 meters wide. The total area of doors and windows is 43.6 square meters. The top and surrounding walls of the auditorium should be painted What's the area of the building?
caoweiqi2 ,
15 × 9 + 2 × (15 × 3.2 + 9 × 3.2) - 43.6 = 245 (M2)
A classroom is 9 meters long, 6 meters wide and 3 meters high. Now we need to paint its walls and ceiling,
What is the painting area of the classroom?
75 Ping
The classroom is 7 meters long, 6 meters wide and 5 meters wide. The four walls and roof should be painted. Except the doors, windows and blackboard, the area is 26 square meters. If every square meter is painted with white paint
0.5 kg, how many kg of coating are needed?
7x6 + 7x3.5x2 + 6x3.5x2-26 107x0.5 = 53.5 (kg)
=42+49+42-26
=107 (M2)
A classroom is 10 meters long and 6 meters wide. It needs to paint its four walls, ceiling, doors, windows and blackboard. The area is 25 meters. If 0.8 kg of paint is needed per square meter, how many kg of paint are needed?
The perimeter of the bottom surface is (10 + 6) × 2 = 32 meters
So the side area is 32 × 3 = 96 square meters
The roof area is 10 × 6 = 60 square meters
So the painting area is 96 + 60-25 = 131 square meters
So 131 × 0.8 = 104.8 kg
The perimeter of a circular fountain is 62.8m. How many square meters does the fountain cover?
2, = 3.14 × 102, = 314 square meters; a: it covers an area of 314 square meters
The perimeter of a round flower bed is 6.28 minutes. How many square decimeters is its area
14, radius 1
The perimeter of a circular flowerbed is 157 meters. How many square meters is the area of the flowerbed?
It's from volume AB, volume one, grade six
(157 / 3.14 / 2) square * 3.14 = 1692.5 square meters
The area of a semicircle is 25.12 square meters. What's its perimeter
3.14×r²÷2=25.12
r²=16
r=4
Perimeter = 3.14 × 4 × 2 + 4 × 2 = 33.12m
Calculate the area of the circle, the perimeter is 28.26 meters
Demand comprehensive formula
Area
=3.14×（28.26÷2÷3.14）²
=3.14×4.5²
=585 square meters
The diameter of the circle is 28.3cm. How many square meters and how many meters are the circumference of the circle
The diameter of the circle is 28.3 cm, which is 0.283 M,
3.14 X 0.283
= 0.628 + 0.2512 + 0.00942
= 0.628 + 0.26062
= 0.88862
The circumference of a circle is 0.88862 meters,
The radius of the circle is 0.1415 meters,
0.1415"
= 0.1415" - 0.0015" + 0.0015"
= ( 0.1415 + 0.0015 )( 0.1415 - 0.0015 ) + 0.0000 0225
= ( 0.14 + 0.003 ) X 0.14 + 0.0000 0225
= 0.0196 + 0.00042 + 0.0000 0225
= 0.0200 2225
3.14 X 0.02002 225
= 0.0628 628 + 0.0000 0628 + 0.0000 00628 + 0.0000 00157
= 0.0628 6908 + 0.0000 00785
= 0.0628 69865
The area of the circle is 0.0628 69865 square meters
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