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OL=√KL²+KO²
OL=√8²+6²
OL=10
LQ=√LM²+MQ²
LQ=√8²+6²
LQ=10
OQ=√OP²+PQ²
OQ=√8²+8²
OQ=8√2
kemudian menggunakan aturan cosinus
a²=b²+c²-2bc.cosA
diterapkan pada soalmu
OQ²=OL²+LQ² - 2(OL)(LQ)cosα
(8√2)²=10²+(10² - 2.10.10 cosα
128=100+100-200.cosα
200.cosα=200-128
cosα=72/200
cosα=0,36
mudah kan???
semoga bermanfaat.