1. a
2. a
4. a

5. a2  =   b2 + c2 - 2 b c cosα

   a  =  b · sinα/sinβ 2_3

   a  =  c · sinα/sinγ 2_3

1. b
2. b
4. b

5. b2  =   a2 + c2 - 2 a c cosβ

   b  =  a · sinβ/sinα 2_3

   b  =  c · sinβ/sinγ 2_3

1. c
2. c
4. c

5. c2  =   b2 + a2 - 2 b a cosγ

   c  =  b · sinγ/sinβ 2_3

   c  =  a · sinγ/sinα 2_3

1. α
2. α
3. ^o
4. α

5. cos α  = (b2 + c2   -  a2)  /2b c

   sinα  =   a· sinβ / b

   sinα  =   a· sinγ / c

1. β
2. β
3. ^o
4. β angle

5. cos β  = (a2 + c2   -  b2)  /2a c

   sinβ  =   b· sinα / a

   sinβ  =   b· sinγ / c

1. γ
2. γ
3. ^o
4. γ angle

5. cos γ  = (b2 + a2   -  c2)  /2a c

   sinγ  =   c· sinα / a

   sinγ  =   c· sinβ / b

1. A
2. A
4. A

5. A  = 1/2 a ·ha

   A  = 1/2 b ·hb

   A  = 1/2 c ·hc

   A  = 1/4√ ((a+b+c)(-a+b+c)(a-b+c)(a+b-c))

1. h_a
2. h_a
4. h_a

5. ha  = 2·A /a

   ha  = b sinγ

   ha  = c sinβ

1. h_b
2. h_b
4. h_b

5. hb  = 2·A /b

   hb  = a sinγ

   hb  = c sinα

1. h_c
2. h_c
4. h_c

5. hc  = 2·A /c

   hc  = b sinα

   hc  = a sinβ

1. r
2. r
4. r

5. r  = 2 /(a+b+c)* 1/4√ ((a+b+c)(-a+b+c)(a-b+c)(a+b-c))

1. R
2. R
4. R

5. R  = (a+b+c)/√ ((a+b+c)(-a+b+c)(a-b+c)(a+b-c))

1. m_a
2. m_a
4. m_a

5. ma  = 1/2/√ (2b2+2c2-a2)

1. m_b
2. m_b
4. m_b

5. mb  = 1/2/√ (2a2+2c2-b2)

1. m_c
2. m_c
4. m_c

5. mc  = 1/2/√ (2a2+2b2-c2)

1. s_a
2. s_a
4. s_a

5. sa  = c·sinβ/sin(β+α/2)

   sa  = b·sinγ/sin(γ+α/2)

1. s_b
2. s_b
4. s_b

5. sb  = a·sinγ/sin(γ+β/2)

   sb  = c·sinα/sin(α+β/2)

1. s_c
2. s_c
4. s_c

5. sc  = a·sinβ/sin(β+γ/2)

   sc  = b·sinα/sin(α+γ/2)

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