The most viewed math problems
- It is rectangular?
Size of two of the angles in a triangle are: α=110°, β=40°. Is it a right triangle?
The root of the equation ? is: ?
56 children lined up in groups of three. How many children did not create a trio?
- Playing cards
How many possible ways are to shuffle 7 playing cards?
Calculate the 4.6 ‰ of 199.
Pediatrician this month of 20 working days takes 8 days holidays. What is the probability that on Monday will be at work?
- Reverse Pythagorean theorem
Given are lengths of the sides of the triangles. Decide which one is rectangular: Δ ABC: 77 dm, 85 dm, 36 dm ? Δ DEF: 55 dm, 82 dm, 61 dm ? Δ GHI: 24 mm, 25 mm, 7 mm ? Δ JKL: 32 dm, 51 dm, 82 dm ? Δ MNO: 51 dm, 45 dm, 24 dm ?
Hanka has 6 apples more than Juro and 7 apples less than Mirka. Mirka has 23 apples. How many apples has Hanka and how many Juro?
- Chickens and rabbits
In the yard were chickens and rabbits. Together they had 28 heads and 78 legs. How many chickens and how many rabbits was in the yard?
Railways climb 7.4 ‰. Calculate the height difference between two points on the railway distant 3539 meters.
Are two right triangles similar to each other if the first one has a acute angle 70° and second one has acute angle 20°?
Lentilka made 31 pancakes. 8 don't fill with anything, 14 pancakes filled with strawberry jam, 16 filled with cream cheese. a) How many Lentilka did strawberry-cream cheese pancakes? Maksik ate 4 of strawberry-cream cheese and all pure strawberry pancak
- Circle chord
What is the length d of the chord circle of diameter 51 mm, if the distance from the center circle is 19 mm?
Fields go plow two tractors with various performance. The first tractor plow whole field in 11 hours, the second tractor plow whole field 19 hours longer. How long take plow whole field with two tractors?
In the bowl are plums. How many would be there if we can divide it equally among 8, 10 and 11 children?
- Cube diagonal
Determine the length of the cube diagonal with edge 37 mm.
From which law follows directly the validity of Pythagoras' theorem in the right triangle? ?
- Rectangular cuboid
The rectangular cuboid has a surface area 5334 cm2, its dimensions are in the ratio 2:4:5. Find the volume of this rectangular cuboid.
Can be rectangular triangle equilateral?
The swimming pool is 10 m wide and 8 m long and 153 cm deep. How many hectoliters of water is in it, if the water is 30 cm below its upper edge?