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If the area of a triangle is 30 square centimeters less than that of a parallelogram equal to its base and height, what is the area of the triangle?
30÷（2-1），
=30÷1，
=30 (square centimeter);
A: the area of this triangle is 30 square centimeters
A parallelogram and a triangle are equal in base and height. Given that the area of a parallelogram is 25 square centimeters, what is the area of the triangle?
25 △ 2 = 12.5 (square centimeter)
A: the area of the triangle is 12.5 square centimeters
The area of a parallelogram is 36 square centimeters, and the area of the triangle with its equal base and height is______ Square centimeter
36 △ 2 = 18 (square centimeter)
A: the area of the triangle is 18 square centimeters
So the answer is: 18
(2009 Tongan District) a parallelogram and a triangle have the same base and height. If the area of a parallelogram is 30 square centimeters, the area of the triangle is () square centimeters A. 45 B. 30 C. 15 D. Can't be sure
30 △ 2 = 15 (square centimeter),
A: the area of the triangle is 15 square centimeters,
Therefore, C
A triangle and a parallelogram have the same area and the same bottom. The height of the parallelogram is 8 cm. How many centimeters is the height of the triangle?
The height of the triangle is 8 × 2 = 16 cm
It is known that a triangle and a parallelogram have the same area and the length of their bottom edges is equal. If the height of a parallelogram is 8 cm, The height of this triangle should be () cm
The triangle area is the base times the height divided by 2, while the quadrilateral area is the same as the base times the height area, so twice the height is 16
A triangle and a parallelogram have the same area and height. If the base of the parallelogram is 8 cm, then the base of the triangle is______ Centimeter
Let the base of the triangle be A1, the base of the parallelogram A2, the area s and the height H,
Because the base of the triangle A1 = 2S △ H = 2S
h，
The base of a parallelogram A2 = s △ H = s
h，
So the base of a triangle is twice the base of a parallelogram,
The base of the triangle is 8 × 2 = 16 (CM),
A: the base of the triangle is 16 cm
So the answer is: 16
The base and area of a triangle and a parallelogram are equal respectively. The height of the triangle is 5cm, and the height of the parallelogram is______ .
The area of a parallelogram is s = ah1,
The area of the triangle is: S = ah2 △ 2,
So ah1 = ah2 △ 2,
h1=h2÷2，
The height of the parallelogram is 5 △ 2 = 2.5 (CM),
A: the height of the parallelogram is 2.5 cm,
So the answer is: 2.5cm
If the bisector of the vertex angle of an isosceles triangle is 8cm in length and 32cm2 in area, then its bottom edge length is______ cm．
∵ the length of bisector of vertex angle of isosceles triangle is 8cm,
The height of the bottom edge of the triangle is 8cm long,
The length of its bottom edge is: 32 × 2 △ 8 = 8 (CM)
A: its bottom is 8cm long
So the answer is: 8
1. The waist length of an isosceles triangle is 8 cm and the bottom edge is 3 cm. It needs at least () cm long rope to form the isosceles triangle 2. The lengths of the two sides of a triangle whose three sides are full centimeters are 7cm and 15cm respectively. The longest and shortest length of the third side is () cm and () cm 3. Use two regular triangles with a circumference of 60 cm to make a quadrilateral. The circumference of the quadrilateral is () cm 4. A wire can be enclosed into a square with a side length of 3cm. If it is enclosed into an equilateral triangle, the side length of the equilateral triangle is () cm 5. The isosceles triangle with 10 degree vertex angle is () triangle 6. The sum of a base angle and a top angle of an isosceles triangle is 130 degrees, and its top angle is () 7. One of the angles in an isosceles triangle is 80 degrees. The other two angles may be () degrees and () degrees, or () degrees and () degrees
1. The waist length of an isosceles triangle is 8 cm and the bottom edge is 3 cm. It needs at least (19) cm long rope to encircle the isosceles triangle. 2. The lengths of both sides of a triangle whose three sides are full centimeters are 7cm and 15cm respectively. The longest length of the third side is (21) cm and the shortest is (9) cm
RELATED INFORMATIONS
- 1. If an isosceles triangle has a right angle and its area is 50 square centimeters, then the sum of its two right angles is______ Centimeter
- 2. In the triangle ABC, the angle a plus the angle B is equal to the angle c, and the angle B is equal to twice the angle A. find the degree of the angle a, the angle B and the angle C
- 3. In the triangle ABC, angle c + angle a = 2, angle B, angle c - angle a = 80 degrees, calculate the angles a, B, C for several degrees and tell how to calculate them
- 4. In ABC + S 2, we find the maximum area of △ 2, C = 2 for the root of ABC
- 5. 1. The degree ratio of the three inner angles of a triangle is 3:2:7. What is the largest angle? 2. There are three workshops in a factory. There are 90 people in workshop a. the number of people in workshop B is 4 / 5 of that in workshop a and 4 / 3 in workshop C. how many people are there in workshop C? 3. Xiaogang read a book, read 56 pages every day, read 4 days, just read 8 / 11 of the whole book. How many pages are there in this book? How many pages are left? 4. The tallest animal in the world is giraffe. A giraffe is 5 meters tall, 2 / 3 higher than an elephant. How many meters is the elephant tall?
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- 8. In △ ABC, ∠ a = 1 / 3 ∠ B = 1 / 5 ∠ C, calculate the degree of each internal angle of a triangle
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- 10. As shown in the figure, △ ABC is an isosceles right triangle, ∠ a = 90 ° and points P and Q are moving points on AB and AC respectively, and satisfy BP = AQ, D is the midpoint of BC (1) It is proved that △ PDQ is an isosceles right triangle; (2) When the point P moves to where, the quadrilateral apdq is square, and explain the reason
- 11. The area of a parallelogram is 24 square centimeters. What is the area of the triangle with its equal base and height?
- 12. The circumference of a circular flower bed is 31.4 meters, and 2 / 5 of the poisonous land in the flower bed is planted with roses. How many square meters is the planting area of rose flowers?
- 13. 1. Around a circular flower bed with a diameter of 16 meters, there is a stone road with a width of 2 meters. What is the area of this stone road? 2. The bottom surface of a wooden basin is round. A 2.552m long iron wire is enclosed at its bottom, and 0.04m is used at the wire joint. What is the diameter of the bottom surface of the basin?
- 14. The perimeter of a circular flower bed is 18.84m. A stone road with a width of 0.5m is paved around it to calculate the area of the stone road
- 15. There is a circular flower bed with a diameter of 16m, and a 2m wide path is built around it (1) What is the area of this path? (2) How many lamps should be installed along the edge of the circular path every 5m?
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- 18. The height of a triangle is 5 or 2 meters. If the height is extended by 2 meters, the area of the triangle line will be increased by 10 square meters. What is the area of the original triangle
- 19. The area of a triangle is 12.5 DM2 less than that of a parallelogram of equal base and height______ dm2．
- 20. The area of a triangle is 12 square decimeters, the bottom is 6 decimeters, and the height is______ Decimeter