All Spanish adjectives that end in -ar have the same form for masculine and feminine singular.
Have a look and listen to these examples:
To form the masculine and feminine plurals of these adjectives that end in -ar add -es.
Unas mesas circulares
Some circular tables.
Unos pendientes circulares.
Some circular earrings.
Estos cantantes de pop son muy populares ahora.
These pop singers are very popular right now.
Las minifaldas eran populares en los años 60.
Miniskirts were popular in the sixties.
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Una chica ejemplar.
A model girl.
Las minifaldas eran populares en los años 60.
Miniskirts were popular in the sixties.
Un chico ejemplar.
A model boy.
Estos cantantes de pop son muy populares ahora.
These pop singers are very popular right now.
Unos pendientes circulares.
Some circular earrings.
Unas mesas circulares
Some circular tables.