Case Study Scenario: Class X students setup sports field. Four students sit at points A(3,4), B(6,7), C(9,4) and D(6,1).
Question: Check if quadrilateral ABCD is a square.
Correct Answer:Yes, ABCD is a square
Step-by-step Solution:
AB = BC = CD = DA = 3√2 units. Diagonals AC = BD = 6 units. Therefore ABCD is a square.
Q17Case Study4 Marks
Case Study Scenario: To conduct sports day activities in a rectangular field ABCD, lines drawn at 1m. Niharika runs 1/4th distance AD (100m) on 2nd line and posts green flag. Preet runs 1/5th distance on 8th line and posts red flag.
Question: Find distance between both flags and midpoint coordinates.
Correct Answer:√61 m (~7.81m) and (5, 22.5)
Step-by-step Solution:
Green flag G(2, 25), Red flag R(8, 20). Distance = √[(8-2)² + (20-25)²] = √(36+25) = √61 m. Midpoint = (5, 22.5).
Q18PYQ5 Marks
Find ratio in which line 2x + y - 4 = 0 divides line segment joining A(2, -2) and B(3, 7).
Correct Answer:2 : 9
Step-by-step Solution:
Let ratio be k:1. P((3k+2)/(k+1), (7k-2)/(k+1)). Substitute in 2x+y-4=0 ⇒ 2(3k+2) + (7k-2) - 4(k+1) = 0 ⇒ 9k = 2 ⇒ k = 2/9.
Q19PYQ5 Marks
If A(-5,7), B(-4,-5), C(-1,-6) and D(4,5) are vertices of quadrilateral, find its area.
Correct Answer:72 sq units
Step-by-step Solution:
Split into △ABC (area = 35) and △ADC (area = 37). Total area = 35 + 37 = 72 sq units.
Q20PYQ5 Marks
Find coordinates of circumcentre of triangle formed by A(5,1), B(1,5) and C(6,6).
Correct Answer:(3, 3)
Step-by-step Solution:
Circumcentre O(x,y) is equidistant: OA² = OB² = OC² ⇒ x = 3, y = 3.