Объяснение:
1.5.
(a+b)² = a² +b² - 2ab cos(α) = 5² +3² - 2*5*3 cos(30) =
= 25+9 - 30 *√3/2 = 34 -15√3
a+b = √ (34 -15√3) = 2,8 см
1.6.
ax = a*cos(a) = 1 *cos(30) = 1 *√3/2 = √3/2 см
ay = a*sin(a) = 1 *sin(30) = 1 *1/2 = 0,5 см
bx = 0
by = b = 1 см
1.7.
bx = b = 1 см
by = 0
1.8.
(a+b)² = a² +b² - 2ab cos(2α) = 5² +5² - 2*5² cos(2*60) =
= 2*5² ( 1-cos(120) ) = 2*5² ( 1 +1/2 ) = 2*5² *3/2 = 3*5²
a+b = √ (3*5²) = 5√3 см
(a+b)x = 0
(a+b)y = a+b = 5√3 см
1.11.
cx = ax+bx = a*cos(a) +b*cos(β) = 10*cos(60) +10*cos(60) =
= 10*1/2 +10*1/2 = 5+5 =10 см
сy = ay-by = a*sin(a) +b*sin(β) = 10*√3/2 -10*√3/2 = 0
Объяснение:
1.5.
(a+b)² = a² +b² - 2ab cos(α) = 5² +3² - 2*5*3 cos(30) =
= 25+9 - 30 *√3/2 = 34 -15√3
a+b = √ (34 -15√3) = 2,8 см
1.6.
ax = a*cos(a) = 1 *cos(30) = 1 *√3/2 = √3/2 см
ay = a*sin(a) = 1 *sin(30) = 1 *1/2 = 0,5 см
bx = 0
by = b = 1 см
1.7.
ax = a*cos(a) = 1 *cos(30) = 1 *√3/2 = √3/2 см
ay = a*sin(a) = 1 *sin(30) = 1 *1/2 = 0,5 см
bx = b = 1 см
by = 0
1.8.
(a+b)² = a² +b² - 2ab cos(2α) = 5² +5² - 2*5² cos(2*60) =
= 2*5² ( 1-cos(120) ) = 2*5² ( 1 +1/2 ) = 2*5² *3/2 = 3*5²
a+b = √ (3*5²) = 5√3 см
(a+b)x = 0
(a+b)y = a+b = 5√3 см
1.11.
cx = ax+bx = a*cos(a) +b*cos(β) = 10*cos(60) +10*cos(60) =
= 10*1/2 +10*1/2 = 5+5 =10 см
сy = ay-by = a*sin(a) +b*sin(β) = 10*√3/2 -10*√3/2 = 0