A^2 + b^2 = c^2 That's the Pythagorean Theorem
Sin B = b/c
m<A + m<B = 90° because there are 180° in a triangle
Rectangle 1. p. 146 in
rectangle 2. p. 146 in
the perimeters are the same. the rectangles are equal
D18∈{1,2,3,6,9,18}
suma e 1+2+3+6+9+18= 39
D81∈{1,3,9,27,81}
suma e 1+3+9+27+81=121
2. M8∈{0,8,16,24,32.....}
M18∈{0,18,36,54,72.....}
M21∈{0,21,42,63,84....}
M35∈{0,35,70,105,140...}
M64∈ {0,64,128,192,256...}
M111∈ {0,111,222,333,444....}
3. a) A, b) A , c) A, la d) nu e complet, e) A, f) A, g) A, h) A, i) A, k) 10 | 7*10 A, l) F, m) F, n) A, o) F, p) A, q) A, r) (36*5-40) divizibil cu 10, (180-40)=140 divizibil cu 10, A, s) 36| (64+30-50), 36 | 44 F, 60.000 divizibil cu 160
