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When a = 17.4, B = 2.6, the remaining area is () A.289 B.298 C.296 D.269
Determinant
Area = square of a - square of 4 * B
=17.4-4 * 2.6 = 275.72
There seems to be something wrong with your answer
Inside the square with side length of (6 √ 15 + 5 √ 5), dig out a square with side length of (6 √ 15-5 √ 5), and calculate the area of the remaining part
That is, (6 √ 15 + 5 √ 5) & # 178; - (6 √ 15-5 √ 5) & # 178;
=[(6√15+5√5)+(6√15-5√5)][(6√15+5√5)-(6√15-5√5)]
=(6√15+5√5+6√15-5√5)(6√15+5√5-6√15+5√5)
=12√15*10√5
=120√75
=600√3
The area and the sum of the two circles are 5338 square centimeters. The diameter of the big circle is eight times the radius of the small circle?
Let the radius of the small circle be X
Then π R * r + π 4 * r * 4 * r = 5338
So r = 10 (CM)
The diameter of the great circle is 80 and the circumference is 251.2 cm
The diameter of the small circle is 20 and the circumference is 62.8 cm
The area of the big circle is 84 square centimeters larger than that of the small circle, and the perimeter ratio is 4:3?
Large circle area: small circle area = 16:9
Large circle area = 84 △ 16-9 × 16 = 192 square centimeters
Small circle area = 192-84 = 108 square centimeter
There are two circles. The difference between their areas is 209 square centimeters. The circumference of the big circle is one and nine times that of the small circle. What is the area of the small circle?
Large circle area: small circle area = 10 / 9 × 10 / 9:1 × 1 = 100:81
Area of small circle = 209 ÷ (100-81) × 81 = 891 square centimeter
There are two circles. The difference of their area is 209 square centimeters. The small circle is 9 / 10 of the circumference of the big circle. What is the area of the small circle?
Area of small circle in area of large circle = (9 / 10) × (9 / 10) = 81 / 100
Large circle area = 209 △ 1-81 / 100 = 1100 square centimeter
Small circle area = 1100-209 = 891 square centimeter
Draw the largest circle in a square with a side length of 6cm. What are the perimeter and area of the circle?
There is also a wire 6.28 meters long, just in a circular coil full of 20 circles, the radius of the coil is how many centimeters?
A semicircle, 5cm in diameter, area and perimeter
The maximum radius r = 6 △ 2 = 3cm, perimeter = 2 × π × r = 6 π = 18.84cm, area = π × R & # 178; = 9 π = 28.26cm2, circumference = 6.28 △ 20 = 0.314m, coil radius = perimeter △ 2 △ π = 0.05m, radius = r = diameter △ 2 = 2.5cm, area = # 189; circle area = π × R & # 178; = 6.25 π = 9.81, flat
Draw the largest circle in a square with a side length of 5cm. What are the perimeter and area of the circle
Week: 3.14 * 5 = 15.7
Surface: 3.24 * 5 / 2 * 5 / 2 = 19.625
Cut the largest circle from a square with a side length of 12 cm. What are the perimeter and area of the circle?
12×3.14
Draw the largest circle in a square with a side length of 4 decimeters. The circumference of the circle is () decimeters
A. 12.56B. 6.28C. 10.28D. 25.12
14 × 4 = 12.56 (decimeter), answer: the circumference of this circle is 12.56 decimeter
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