In a right-angled triangle, the product of two sides is equal to half of the square of the third side i.e. hypotenuse. One of the acute angles must be
60°Â
30°Â
45°Â
45°Â
If two concentric circles are of radii 5cm and 3cm, then the length of the chord of the larger circle which touches the smaller circle is
6 cm
7 cm
10 cm
10 cm
Inside a square ABCD, ΔBEC is an equilateral triangle. If CE and BD intersect at O. then ∠BOC is equal to
60°Â
75°Â
90°Â
90°Â
A point D is taken from the side BC of a right-angled triangle ABC, where AB is hypotenuse. Then
AB2 + CD2 = BC2 + AD2
CD2 + BD2 = 2 AD2
AB2 + AC2 = 2AD2
AB2 + AC2 = 2AD2
Let C be a point on a straight line AB. Circles are drawn with diameters AC and AB. Let P be any point on the circumference of the circle with diameter AB. If AP meets the other circle at Q, then
QC || PB
QC is never parallel to PB
An isosceles triangle ABC is right-angled at B. D is a point inside the triangle ABC. P and Q are the feet of the perpendiculars drawn from D on the sides AB and AC respectively of ΔABC. If AP = a cm, AQ = b cm and ∠BAD = 15°, sin 75° =Â
D and E are two points on the sides AC and BC respectively of Δ ABC such that DE = 18 cm, CE = 5 cm and ∠DEC = 90°, If tan ∠ABC = 3.6, then AC : CD =Â
BC : 2 CE
2 CE : BC
2 BC : CE
2 BC : CE
C.
2 BC : CE
 D is a point on the side BC of a triangle ABC such that . E is a point on AD for which AE : ED = 5 : 1. If  and then  thenÂ
30°
45°
60°
40°