Introduction to Trigonometry Short Q and A Q1: If sin 3A = cos (A – 26°)- where 3A is an acute angle- find the value of A. Answer: sin 3A = cos (A – 26°) ∵ sin 3A = cos (90°
Real Numbers (NCERT Exemplar Solutions Ex 1.1) Question 4: If the HCF of 65 and 117 is expressible in the form 65m − 117- then the value of m is (A) 4 (B) 2 (C) 1 (D) 3 Answer: (
Real Numbers (NCERT Exemplar Solutions Ex 1.1) Question 1: For some integer m- every even integer is of the form (A) m (B) m + 1 (C) 2m (D) 2m + 1 Answer: (C) 2m Explanation: Even int
Lines and Angles - Brain Teaser Q: What is the measure of ∠A + ∠B + ∠C + ∠D + ∠E in the figure given below- assuming no angles and sides are equal. Give reason to your answer.
Real Numbers (NCERT Exercise 1.2) Q1: Express each number as product of its prime factors: (ⅰ) 140 (ⅱ) 156 (ⅲ) 3825 (ⅳ) 5005 (ⅴ) 7429 Answer: (ⅰ) 140 = 2 × 2 × 5 × 7 =
