Question Bank  Geometry  Hemant Malhotra

Q17) A green colour cube is cut into smaller and identical cubes with 6 cuts. The cube is cut with a knife which applies red colour to the surfaces of the cubes while cutting. The smaller cubes are further cut with 6 cuts into smaller and identical cubes, with a knife which does not apply any colour to the surface. The questions are based on the cubes obtained after these cuts. How many smaller cubes have three faces coloured red?
a) 48
b) 52
c) 56
d) 64

@hemant_malhotra right angled triangle is of form 81517
area of triangle = (1/2)xhx17 = 1/2x8x15
h = 7

Q18) A, B, C, ..... till K are 11 points, spaced on the circumference of a circle in that order. What is the sum of all the corner angles of the ‘star’ formed by joining the points AEIBFJCGKDHA  in that order?

Q19) In a cyclic quadrilateral ABCD, if AB = 2, BC = 3, CD = 4 and DA = 5, what is the ratio of the lengths of the diagonals?
(1) 7 : 11
(2) 11 : 13
(3) 10 : 11
(4) 13 : 15

@hemant_malhotra
simple ..centroid will be 1,3

@hemant_malhotra decrease by 1 percent

Q20) What is the least possible number of cuts required to cut a cube into 34 identical pieces ?

let number of cuts along length , width and height is a,b,c and total number of cuts=a+b+c
number of cubes =(a+1)(b+1)(c+1)
If product is cnstant sum will be minimum if they are very close to each other
here (a+1)(b+1)(c+1)=1 * 2 * 17
so a+1+b+1+c+1=1+2+17 so a+b+c=17

Q21) A right circular cylindrical vessel having height 20 cm and inner diameter 10 cm is filled with water upto 15 cm of it's height as measured from the base. Find the angle by which the cylinder must be tilted so that the water in the cylinder is just about to fall out?

Q22) The sides of a triangle of area 6 are in AP. If the sides have integer lengths, what is the length of the longest side?

Q23) If in a triangle ABC, AB = BC = 6m and CD = 10cm then what is the difference between the incentre and centroid of the triangle ?

Q24) In an art class the teacher tells the students to draw the largest circle possible on a piece of paper in the shape of a square and then draw a rectangle lying between the circumference of the circle and the edge of the square such that a corner of the rectangle lies on the circumference of the circle and two sides of the rectangle coincide with those of the square. If the rectangle measures 10 cm × 20 cm then what is the area of the sheet of paper?

Q25) A circle circumscribes a regular hexagon H1 and is inscribed inside a regular hexagon H2. What is the ratio of the areas of H1 and H2?

Q26) In a triangle ABC with AB = 14 cm, D and E are points on BC and AC respectively such that BE and AD intersect at point F and the area of ∆ BFD = area of ∆ AFE. Also BD:DC = 2:5. Find the length of DE.

Q27)

Q28) If the sum of lengths of three sides of a rectangle is 100 units, then find the maximum possible area of the rectangle ?

@hemant_malhotra 1000?

@hemant_malhotra 218?


@hemant_malhotra 1250?