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PGSPD² = 20² - (10 + 6)²
PGSPD² = 20² - 16²
PGSPD² = 400 - 256
PGSPD² = 144
PGSPD = √144
PGSPD = 12 cm
= √20² - (10+6)²
= √400-256
= √144
= 12 cm