Then ab = 3.5 (cm)
According to the triangle area: the base times the height divided by 2, that is, (AB×CD)÷2=(AC×BC)÷2.
2. 1×2.8÷2=3.5×CD÷2
CD= 1.68 (cm)
2. According to Pythagorean theorem: AD square equals AC square minus CD square.
That is, the square of AD is equal to the square of 2. 1 minus the square of 1.68 is equal to 1.5876.
AD= 1.26 (cm)
BD squared equals BC equation minus CD squared.
That is, the square of BD equals to the square of 2.8 minus the square of 1.68 equals to 5.0 176.
BD=2.24 cm