The most viewed math problems
The root of the equation (x-19)² -10 = x² -11x is (equal or greater or less than zero)? ...
- It is rectangular?
Size of two of the angles in a triangle are: α=110°, β=40°. Is it a right triangle?
Calculate the 4.6 ‰ of 199.
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?
- Chickens and rabbits
In the yard were chickens and rabbits. Together they had 18 heads and 56 legs. How many chickens and how many rabbits were in the yard?
Pediatrician this month of 20 working days takes 8 days holidays. What is the probability that on Monday it 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,
Are two right triangles similar to each other if the first one has an acute angle 70°, and the second one has an acute angle 20°?
Hanka has 5 apples more than Juro and 6 apples less than Mirka. Mirka has 19 apples. How many apples has Hanka and how many Juro?
Railways climb 7.4 ‰. Calculate the height difference between two points on the railway distant 3539 meters.
Lentilka made 31 pancakes. Eight 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 four strawberry-cream cheese and all pure strawberry panc
- Circle chord
What is the length x of the chord circle of diameter 115 m if the distance from the center circle is 11 m?
Fields go plow two tractors with various performances. The first tractor plows the whole field in 11 hours, the second tractor plows the whole field 19 hours longer. How long take plow the 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?
From which law follows directly the validity of Pythagoras' theorem in the right triangle? ...
- Roman numerals
Write numbers written in Roman numerals as decimal.
- Cube diagonal
Determine the length of the cube diagonal with edge 37 mm.
Can an equilateral triangle have a right angle?
- Rectangular cuboid
The rectangular cuboid has a surface area 5334 cm2, and its dimensions are in the ratio 2:4:5. Find the volume of this rectangular cuboid.