Maths practice for 12-year-olds - page 342 of 347
Number of problems found: 6923
- Circumscription
Calculate the radius of the circumscribed circle of a rectangle with sides 3 and 6. Can a circle be inscribed in a rectangle? - Cable
A cable consists of 5 strands, each strand made up of 11 wires with a diameter of d = 0.3 mm. Calculate the total cross-sectional area of the cable. - Money
Everyone complains about a lack of money. In reality, there is no shortage of money — only a relative scarcity of goods and services. By what percentage would the prices of all goods and services immediately rise if everyone suddenly had 9 times more mone - Square
Calculate the area of a square with diagonal 17 cm. - Determine the number
Determine the number x that x+8 is (7)/(5) from one half of 7 x -1. - Rates
When gas consumption, the consumer may choose one of two rates: rate A - which pays 0.4 € per 1 m³ of gas a flat monthly fee of 4.2 € (regardless of consumption) rate B - which pays 0.351 € per 1 m³ of gas a flat monthly fee of 10.1 € From what monthly co - Diagonal
Can a diagonal of a rhombus be twice as long as its side? - 3-bracket 3
Two angles of a triangle are 90° and 45°. Does the triangle have at least two equal sides? - 3-bracket
Can the largest angle in a triangle be less than 20°? - Diagonal
Can a diagonal of a rhombus be equal in length to its side? - Chord
A point on a circle is both an endpoint of a diameter and an endpoint of a chord whose length equals the radius. What is the angle between the chord and the diameter? - Numeric question
Is it possible a negative, irrational number? - Aircraft
Flight length 2886 km took 4 hours. The airport passengers had to arrive hours in advance, 2 hours. Departure was delayed for 2.3 hours. The destination airport formalities took 0.5 hours. Calculate the average speed of passenger travel from arrival to le - Number
Is number 2.8814789 irrational? - Ratio v2
Decrease in the ratio 8:16 number 20.2. - Ratio Increase the number 25.6 in the ratio 7:4.
- Trunk
Calculate the length of the longest fishing rod that can be placed in a car boot with dimensions 152 × 82 × 81 cm. - Box
Calculate the angle between the base of a cuboid with dimensions 5 × 10 and its space diagonal of length 13. - Observatory
An observatory dome has the shape of a hemisphere with diameter d = 10 m. Calculate its surface area. - Rotating cone II
Calculate the lateral surface area of a cone with base radius r = 20 cm and height h = 10 cm.
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